Step 15: Draw a couple of lines behind the front and hind flippers for the visible portion of the flippers on the other side.

Step 16 (optional): For a cleaner look, erase as much of you can of the initial guide lines. Don't worry about erasing all of the guides. It's okay to leave some behind. Also re-draw any final sketch lines that you may have accidentally erased.

Final Step (optional): Add some shading to your sea turtle drawing to give it more dimension and volume. Pick the direction of the light source when shading so that the shadows are consistent with it. Vary the pressure on your pencil to get different degrees of tonal value.

You can add more detail to your sea turtle for a more completed drawing. Green sea turtles have big, dark scales on their body, so draw shapes of different sizes throughout its skin and shade them in. Drawing the sea turtle's scaly skin can be very time-consuming, so you can just add a solid value throughout the body if you don't want to add the scales. The scales on the edges of the flippers are bigger, and they get smaller closer to the center. It's a good idea to use reference if you want more accuracy when adding the scales. Add more value onto the entire sea turtle drawing. The value should be lighter than the spots. Add an even value to the shell for a smooth finish or an uneven value for a worn-down look. Don't forget to pause the "How to Draw a Sea Turtle" video so you can follow at your own pace.